Can't delete messages in Hotmail (Outlook.com)

Good morning, new to this forum but have been long time subscriber to Windows Secrets and Langa List.

Problem is on wife's desktop computer, also on her android phone.

Ipad and android tablet also have access to her emails but are NOT being affected.

Desktop computer running Win. 7 Home Prem. 64 bit

The problem started about a week ago, she uses ThunderBird email client, there are 2 Hotmail and 1 Verizon accounts set up there, the 2 Hotmail accounts AND the Hotmail accounts on the phone and tablets are ALL set up as IMAP.

Only 1 of the Hotmail accounts is affected on ALL devices.

Problem - I can "delete" the emails from the "inbox" but they will show up again almost immediately, they do go to the "delete folder" but same problem there, they go away but reappear quickly and the more I delete from the "inbox" they keep multiplying in the "delete" folder", there are over 50 of the same messages now.

The same thing happens in her Hotmail account when I access it through a web browser.

I have tried every way I know of to delete to no avail, also have "compacted" the folders in TB - still reappearing

I have tried solutions found from various searches - nothing works -

I removed the account in TB and reinstalled - same problem

This all started after I "removed" the ( Lightening )(it is a calendar) add on in TB which came along after the last TB update, I did an "over the top" upgrade of TB to ver. 38.2.0

George, I do not have the exact same interface as it shows on the PDF, but here is a screen shot from the Hotmail account in the FF browser. Looks like I have it set up the same way - still can not delete messages -

Would anybody else like to offer a solution, the account still works fine, she can delete new emails with NO problems, just those 3 pesky emails that will not delete ????, the "delete" folder now has well over 60 of the same emails stuck there, very frustrating.

I have NOT tried yet to: delete the problem account from ALL devices (phone, tablets, desktop - both web browser and Thunderbird), wait for a few days then try to open up a new account (in the web browser only) using the same account name, only as a POP 3 account, hoping that way the problem emails can be removed from the server

or

Try to contact M$ (they are stuck on there Hotmail server) and see if they can remove them ????